The iconic venue’s stage has had to be extended half way into the ballroom, and the capacity almost halved to fit 60 classical musicians.

And the band - Fran, Dougie Payne, Andy Dunlop and Neil Primrose - are hoping for best behaviour from their fans, who in the past have been guilty of that irritating and dangerous form of joyful expression when the boys are back in town - launching their pints skywards and stagewards.

Bass player Dougie said: “We don’t want any pints of lager landing in the tuba. We don’t want to drown the tuba player.”

The multi-million selling band have just released their eighth album, Everything At Once, which scored them a top five slot on the UK album chart.

Fran said: “We’re thrilled we were asked to do this. It’s Glasgow. It’s the Barrowlands. Everyone we’ve met over 20 years in bands talks about this place. It’s got a certain thing. We’re here, we’re from here and we have all these guys from the orchestra who we’d normally go to. But this time we’re taking them to our place.

“I don’t know who’ll be more nervous. We’ll probably all be nervous, but it’ll be those nice nerves which make the performance that bit more electric.”

The gig will also feature a special appearance from a selection of singers from Glasgow’s Parsonage Choir.

Classical composer Ben Foskett has relished arranging the parts for the one-off gig.

He said: “It’s not about changing the music, it’s about changing the detail. The orchestra become part of the band - they have to become part of Travis and the effect is it will sound like a bigger band. It’s about taking a rhythm guitar part, for example, and transforming it into, say, a woodwind part and creating textures out of that.

“Their guitar solos are very strong material, so I’ve put those into the orchestra. People will hear it very differently.”